I. Why Choose VNG CloudCDN for Evaluation
VNG Cloud It has established a user base in the Vietnamese market and the Asia-Pacific region for its cloud services, with its CDN service (vCDN) positioned as
High Availability Acceleration + DDoS Protectionand possesses distinctive features in localized access and network link optimization.
Unlike pure overseas CDNs, it functions more as an option for “regional acceleration and optimized access for domestic and Southeast Asian users.”
II. Test Environment and Real-World Access Scenarios
| Project | Explanation |
|---|---|
| Testing Party | The Cybersecurity and Performance Team |
| Business Type | Static resources + API |
| Origin server location | Ho Chi Minh City and Singapore VPS |
| Access Method | VNG Cloud vCDN + CNAME Actual Activation |
| Testing Cycle | Lasting 10 days |
Regarding access configuration,VNG Cloud vCDN Supports multiple acceleration types (Web Accelerator, Object Download, VOD, Livestream) and provides real-time data statistics and monitoring capabilities in the console, enabling engineers to quickly evaluate CDN performance.
III. Packages and Billing Methods (Real-Life Experience)
VNG Cloud's vCDN does not feature a traditional “pay-as-you-go interface,” but instead adopts Pre-allocated Traffic + Real-time Usage Statistics The model allows you to view the traffic consumption for each domain in the console when in use.
| Billing Items | Explanation |
|---|---|
| Billing Method | Pre-configured Traffic Packages + Real-time Monitoring |
| Traffic Monitoring | Break down traffic statistics by domain name |
| SSL Support | Customizable certificates or use platform defaults |
| Multi-domain CNAME | Supports configuring multiple domains based on the package |
Please note that during the trial period, only one CDN domain name can be created, and there is a 100GB traffic limit.
IV. CDN Acceleration Testing Methodology
Acceleration testing focuses on three key metrics: DNS resolution time, Time to First Byte (TTFB), and overall response time.
Use curl Test multiple regional nodes.
curl -o /dev/null -s -w \ DNS: %{time_namelookup}s\n Connect: %{time_connect}s\n TTFB: %{time
"DNS: %{time_namelookup}s\nConnect: %{time_connect}s\nTTFB: %{time_starttransfer}s\nTotal: %{time_total}s\nHTTP: %{http_code}\n" \
https://yourvcdn.domain.com/static/image.jpg
Test nodes: Singapore, Japan, Vietnam, U.S. West Coast
V. CDN Acceleration Test Results
| Region | Time to First Byte (TTFB) | Total(s) | HTTP Response Codes |
|---|---|---|---|
| Vietnam (VN) | 0.038 | 0.112 | 200 |
| Singapore (SG) | 0.052 | 0.136 | 200 |
| Japan (JP) | 0.068 | 0.158 | 200 |
| United States (US) | 0.138 | 0.268 | 200 |
Test results indicate that vCDN delivers exceptionally low and stable latency in Vietnam and Southeast Asia, with a significant reduction in latency compared to direct connections without CDN. Latency at European and American nodes is slightly higher but remains within acceptable limits.
VI. DDoS Attack Stress Testing Solution
This stress test primarily simulates a medium-scale HTTP flood attack to observe the impact of CDN layer traffic on normal access and origin server load.
| Test Item | Explanation |
|---|---|
| Attack Type | HTTP GET Flood |
| Peak requests | Approximately 30k–50k requests per second |
| Duration | 15 minutes |
| Key Observation Points | Origin Server CPU & User Availability |
VII. DDoS Stress Test Results
| stage | HTTP 200 | HTTP 403/429 | Origin server load | Availability |
|---|---|---|---|---|
| Before the attack | 99.91% TP3T | 0% | 11% | 100% |
| Under attack | 93.0% | 6.51 TP3T | 17% | 99.21 TP3T |
| After the attack | 99.81 TP3T | 0.21 TP3T | 13% | 100% |
Under medium-scale attacks, vCDN automatically discards abnormal requests while maintaining high availability for normal user access, effectively controlling pressure on the origin server.
VIII. HTTP Headers and Cache Validation
curl -I https://yourvcdn.domain.com/static/image.jpg
HTTP/2 200 x-cache: HIT via: vCDN-edge
IX. Frequently Asked Questions (FAQ)
Q1: Does vCDN support custom SSL certificates?
Yes, it supports uploading custom certificates or using the platform's default certificates.
Q2: Does the trial offer any free data allowance?
First-time trial accounts may receive a complimentary 100GB data allowance, but this must be confirmed in the console.
Q3: Is it suitable for domestic access optimization?
Visits to Vietnam and Southeast Asia show significant optimization results; For visits within mainland China, specific nodes require testing.
Q4: How do I clear the cache?
The console provides a purge cache button by domain name, which can clear the edge cache.
Personal opinion
VNG Cloud's vCDN is more like a regionally robust and performance-stable CDN.
Performance in Vietnam and neighboring countries outperforms direct connections, maintaining service availability even under moderate DDoS scenarios.
It is not a CDN that pursues the ultimate in global node coverage, but one that delivers reliable performance in specific regions and specific business scenarios.
For users seeking to reduce latency during Southeast Asian visits while balancing security and control, vCDN is an option worth serious consideration.
